Snippets (text quotes and extracts from authoritative sources)

A Snippet is a short quote or extract (typically a phrase, a sentence, or at most a few sentences) from an authoritative source document such as a specification, technical manual, or design manual. Throughout this site, content is often related to supporting Snippets and each Snippet page links back to the content pages that reference it! The Snippet and Note concepts are very closely related and they support each other.

The Snippet concept is also at the heart of the Parsing Analysis recipe for UML® and SysML®

Kind Snippet quote/extract Source UML keywords SysML keywords Keywords
INFO The internal structure of VaporGenerationPlant uses blocks Heating and Evaporation, which have internal structures depicted in Figure 70 and Figure 71, respectively. SysPhS-1.1 SysPhS, humidifier, HVAC&R
INFO The invariant mass of an electron is approximately 9.109×10−31 kilograms, or 5.489×10−4 atomic mass units. On the basis of Einstein's principle of mass–energy equivalence, this mass corresponds to a rest energy of 0.511 MeV. Wikipedia
INFO The item flow does not require the heater to accept any kind of fluid, because the source of flow is still producing water, regardless of the generality of the item flow. OMG Systems Modeling Language (SysML) 1.6 InformationFlow ItemFlow
INFO The item flow in each case specifies what “does” flow on the connector in the particular usage (e.g., gas, water) and the flow property specifies what can flow (e.g., fluid). This enables type matching between the item flows and between flow properties... OMG Systems Modeling Language (SysML) 1.6 ItemFlow
INFO The itemProperty attribute has no values if the item flow is realized by an Association. OMG Systems Modeling Language (SysML) 1.6 InformationFlow ItemFlow, ItemFlow::itemProperty
INFO The keyword «connector» before a property name indicates the property is stereotyped by ConnectorProperty. OMG Systems Modeling Language (SysML) 1.6 Connector, AssociationClass ConnectorProperty, AssociationBlock, ParticipantProperty, «connector»
NOTATION The label of any compartment shown on the property box that displays contents belonging to the type of the property is shown with a colon character (“:”) preceding the compartment label. OMG Systems Modeling Language (SysML) 1.6 compartment property compartment, SysML Internal Block Diagram, IBD :features compartments, :values compartment, :parts compartment, :properties compartment, :references compartment, :flow properties compartment, :operations compartment
NOTATION The label of any compartment shown on the property box that displays contents belonging to the type of the property is shown with a colon character (“:”) preceding the compartment label. The compartment name is otherwise the same as it would appear on ... OMG Systems Modeling Language (SysML) 1.6 compartment property compartment, SysML Internal Block Diagram, IBD :features compartments, :values compartment, :parts compartment, :properties compartment, :references compartment, :flow properties compartment, :operations compartment
EXAMPLE, INFO The lifelines on Figure D.10 (“whitebox” sequence diagram) need to come from the Power System decomposition. This now begins to consider parts contained in the HybridSUV block. OMG Systems Modeling Language (SysML) 1.6 Lifeline, Sequence Diagram, part HSUV sample problem, Block, part property
INFO The litre (British English spelling) or liter (American English spelling) (SI symbols L and l, other symbol used: ℓ) is a metric unit of volume. It is equal to 1 cubic decimetre (dm^3), 1000 cubic centimetres (cm^3) or 0.001 cubic metre (m^3). Wikipedia litre, units, scientific unit system, volume
INFO The lower and upper properties of the stereotype give the minimum and maximum number of values, respectively, of the property at the bound end of the related bound reference, for each object reached by navigation along its binding path. OMG Systems Modeling Language (SysML) 1.6 EndPathMultiplicity, BoundReference, EndPathMultiplicity::lower, EndPathMultiplicity::upper
EXAMPLE, INFO The lower connector shows its connector property explicitly, enabling the pipe it contains to be connected to a mounting bracket (the additional part and connector definitions are omitted for brevity). OMG Systems Modeling Language (SysML) 1.6 Connector AssociationBlock, SysML specification figure
INFO The magnitude of fluid flow rate through the pipe fluidFlow is the same as the magnitude of flow rates opening1FluidFlow and opening2FluidFlow going through the pipe’s openings, though the values differ in sign. SysPhS-1.1 Constraint constraint parameter, ConstraintBlock SysPhS, pressure, hydraulics, fluid flow
INFO The master/slave relationship is indicated by the use of the copy relationship. OMG Systems Modeling Language (SysML) 1.6 Dependency::supplier, Dependency::client AbstractRequirement, Requirement, Copy, AbstractRequirement::/master, AbstractRequirement::text requirements engineering
INFO The message-name appearing in a reply-message-label is the name property of the Message. Unified Modeling Language 2.5.1 reply-message-label, Message, Message::messageSort, MessageSort, MessageSort::reply
INFO The mixer constraint specifies the relationship between its one output and the two inputs that come from the low-pass and high-pass filters. The constraint defines the output to be the average of the inputs. SysPhS-1.1 Constraint ConstraintBlock, constraint parameter SysPhS, signal processing, mixer
INFO The modern English alphabet is a Latin alphabet consisting of 26 letters, each having an upper- and lower-case form. Wikipedia pangram, Webel Parsing Analysis
INFO The most familiar baryons are protons and neutrons, both of which contain three quarks, and for this reason these particles are sometimes described as triquarks. Wikipedia
INFO, NOTATION The name of the referenced property is built by a string of names separated by “.”, resulting in a form of path name that identifies the property in its local context. OMG Systems Modeling Language (SysML) 1.6 Property multi-level property path, pathname dot notation
EXAMPLE, INFO The need also arises, when adding detail to a structural model, to allocate a connector (at a more abstract level) to a part (at a more concrete level). OMG Systems Modeling Language (SysML) 1.6 Connector, part Allocate, «allocate», structural allocation, Block, part property
INFO The neutron ... is a spin-½ fermion. Wikipedia
INFO The neutron has a magnetic moment, however, so the neutron is influenced by magnetic fields. The neutron's magnetic moment has a negative value, because its orientation is opposite to the neutron's spin. Wikipedia neutron
INFO The neutron has a mean square radius of about 0.8×10−15 m, or 0.8 fm, and it is a spin-½ fermion. Wikipedia neutron
INFO The neutron has no measurable electric charge. With its positive electric charge, the proton is directly influenced by electric fields, whereas the neutron is unaffected by electric fields. Wikipedia neutron
INFO The neutron is a subatomic particle, symbol n or n0, with no electric charge and a mass slightly greater than that of a proton. Wikipedia neutron
INFO The neutron is classified as a hadron, because it is a composite particle made of quarks. The neutron is also classified as a baryon, because it is composed of three valence quarks. Wikipedia neutron
INFO The Newtonian telescope ... usually has a paraboloid primary mirror but at focal ratios of f/8 or longer a spherical primary mirror can be sufficient for high visual resolution. Wikipedia reflecting telescope, reflector, optical telescope, telescope, Newtonian reflector, mirror, primary mirror, parabolic mirror, spherical mirror, f-ratio, focal length
SEMANTIC The notation for a LiteralNull varies depending on where it is used. It often appears as the word “null.” Other notations are described elsewhere for specific uses. Unified Modeling Language 2.5.1 value, LiteralNull, null, notation
INFO The number of protons in the nucleus is the defining property of an element, and is referred to as the atomic number (represented by the symbol Z). Since each element has a unique number of protons, each element has its own unique atomic number. Wikipedia
INFO The number of tokens replaced is equal to the weight of the incoming edge, which defaults to 1. OMG Systems Modeling Language (SysML) 1.6 ObjectNode, MultiplicityElement::/upper, InputPin, Action::/input, token Overwrite, «overwrite»
INFO The objective lens or mirror collects light and brings it to focus creating an image. Wikipedia objective
INFO The only normative stereotype based on AbstractRequirement is the Requirement stereotype, ... OMG Systems Modeling Language (SysML) 1.6 AbstractRequirement, Requirement
INFO The only valid use of a QuantityKind instance is to be referenced by the quantityKind property of a ValueType or Unit. OMG Systems Modeling Language (SysML) 1.6 InstanceSpecification QuantityKind, Unit, Unit::quantityKind, ValueType::quantityKind, Unit::definitionURI, QuantityKind::definitionURI scientific unit system, VIM3
CONSTRAINT The only valid use of a Unit instance is to be referenced by the unit property of a ValueType stereotype. OMG Systems Modeling Language (SysML) 1.6 InstanceSpecification QuantityKind, Unit, Unit::quantityKind, ValueType::quantityKind, Unit::definitionURI, QuantityKind::definitionURI scientific unit system, VIM3
INFO The operation oclIsInState(s) results in true if the object is in the state s. Possible states for the operation oclIsInState(s) are all states of the statemachine that defines the classifier's behavior. For nested states the statenames can be combined... Object Constraint Language Version 2.4 State, Classifier, StateMachine Object Constraint Language
INFO The operations compartment of a Class contains notation for its ownedOperations ... Unified Modeling Language 2.5.1 Class, symbol, compartment, Operation, Class::ownedOperation, operations compartment
SEMANTIC The outgoing ActivityEdges of an InitialNode must all be ControlFlows. The control token placed on an InitialNode is offered concurrently on all outgoing ControlFlows. Unified Modeling Language 2.5.1 Activity, InitialNode, ControlNode, control token, ActivityEdge, ActivityNode::outgoing, ActivityNode::incoming
INFO The output for SignalSource is named y and is typed by RealSignalOutElement, from the signal flow library ... SysPhS-1.1 SysPhS, signal processing
INFO The overall focal ratio of the complete telescope will be f/8 and the optical prescription is an aplanatic Gregorian telescope. Wikipedia Gregorian reflector, aplanatic Gregorian reflector, optical telescope, telescope, reflecting telescope, reflector, Giant Magellan Telescope
EXAMPLE, INFO The package diagram (Figure D.3) shows the structure of the model used to evaluate the sample problem. OMG Systems Modeling Language (SysML) 1.6 Package HSUV sample problem
INFO The parametric diagram is a new SysML diagram type that describes the constraints among the properties associated with blocks. This diagram is used to integrate behavior and structure models with engineering analysis models such as performance, ... OMG Systems Modeling Language (SysML) 1.6 Diagram, Constraint SysML Parametric Diagram, constraint parameter, ConstraintBlock Systems Modeling Language, SysML, mathematics, equation, engineering analysis
INFO The participant properties identify the spigot bank and faucet being connected. The end property on the stereotype refers to the corresponding association end in Figure 9-8. OMG Systems Modeling Language (SysML) 1.6 Port AssociationBlock, ParticipantProperty, ParticipantProperty::end
INFO The Pauli exclusion principle is the quantum mechanical principle which states that two or more identical fermions (particles with half-integer spin) cannot occupy the same quantum state within a quantum system simultaneously. Wikipedia
INFO The pipe constraints specify that the pressure pressureDiff across it is equal to the difference of fluid pressures opening1Pressure and opening2Pressure at each end of the pipe. SysPhS-1.1 Constraint constraint parameter, ConstraintBlock SysPhS, pressure, hydraulics, fluid flow
INFO The port types have an additional flow property that is not in the nested ports. These are for the flow of the engine, as opposed to its parts. OMG Systems Modeling Language (SysML) 1.6 Connector, InformationFlow::conveyed ItemFlow, AssociationBlock
EXAMPLE, INFO The ports on the FuelTankAssembly and InternalCombustionEngine (as shown in Figure D.19) are defined in Figure D.23. OMG Systems Modeling Language (SysML) 1.6 Port HSUV sample problem
INFO The positron is symbolized by e+ because it has the same properties as the electron but with a positive rather than negative charge. Wikipedia
EXAMPLE, INFO The Power requirement is satisfied by the PowerSubsystem, and a Max Acceleration test case verifies the Acceleration requirement. OMG Systems Modeling Language (SysML) 1.6 UseCase HSUV sample problem, Requirement, TestCase, Verify, Block, «subsystem»
INFO The properties appear when an item arrives in a warehouse or a resource is used in a factory, because they are classified as WarehouseItems and FactoryResources at that time, respectively OMG Systems Modeling Language (SysML) 1.6 Classifier, Stereotype, Property PropertySpecificType
INFO The properties disappear once an item leaves a warehouse or a resource is no longer used in a factory, because they are declassified as WarehouseItems and FactoryResources at that time, respectively. OMG Systems Modeling Language (SysML) 1.6 Classifier, Stereotype, Property PropertySpecificType
INFO The PropertySpecificType stereotype can be applied to classifiers that type exactly one property and that are owned by the owner of that property. Classifiers with this stereotype applied shall be generalized by at most one other classifier. OMG Systems Modeling Language (SysML) 1.6 Classifier, Stereotype, Property PropertySpecificType
INFO The quarks that determine the quantum numbers of hadrons are called valence quarks; apart from these, any hadron may contain an indefinite number of virtual "sea" quarks, antiquarks, and gluons, which do not influence its quantum numbers. Wikipedia
INFO The radiator on the left requires distilled water, and its connection to the water heater is compatible because the item flow narrows the items to distilled water. OMG Systems Modeling Language (SysML) 1.6 InformationFlow ItemFlow
INFO The rake notations on the control operator and Monitor Traction indicate they are further defined by activities, as shown in Figure 11-11 and Figure 11-12. An alternative notation for this activity decomposition is shown in Figure 11-13. OMG Systems Modeling Language (SysML) 1.6 rake icon, Activity SysML specification figure, ControlOperator, ControlValueKind, ControlValueKind::disable, ControlValueKind::enable
INFO The reason for this constraint is that the through variable will be used to formulate generalized conservation equations in our system. As such, it is essential that the through variables be conserved quantities. Modelica By Example Modelica, acausal connection
INFO The receptions compartment contains ownedReceptions ... Unified Modeling Language 2.5.1 Class, symbol, compartment, Reception, receptions compartment, Signal
INFO The Refine stereotype specializes UML4SysML Refine and DirectedRelationshipPropertyPath to enable refinements to identify their sources and targets by a multi-level path of accessible properties from context blocks for the sources and targets. OMG Systems Modeling Language (SysML) 1.6 Refine, DirectedRelationship::/source, DirectedRelationship::/target Refine, DirectedRelationshipPropertyPath
INFO The reflecting telescope, which uses mirrors to collect and focus light, was invented within a few decades of the first refracting telescope. Wikipedia telescope, optical telescope, astronomy
SEMANTIC The Regions of the submachine StateMachine are the Regions of the composite State. Unified Modeling Language 2.5.1 State, StateMachine, submachine, Region, composite State
EXAMPLE, INFO The relationship between the views (OperationalView and PerformanceView) and the rest of the user model are explicitly expressed using the «import» relationship. OMG Systems Modeling Language (SysML) 1.6 Package, ElementImport HSUV sample problem, View
INFO The remainder of a proton's mass is due to quantum chromodynamics binding energy, which includes the kinetic energy of the quarks and the energy of the gluon fields that bind the quarks together. Wikipedia
INFO The requirement diagram is a new SysML diagram type. A requirement diagram provides a modeling construct for text- based requirements, and the relationship between requirements and other model elements that satisfy or verify them. OMG Systems Modeling Language (SysML) 1.6 Diagram SysML Requirement Diagram, Requirement, Satisfy, Verify, TestCase, DeriveReqt, Copy, AbstractRequirement::text Systems Modeling Language, SysML, requirements engineering
INFO The requirements diagram described in this clause can depict the requirements in graphical, tabular, or tree structure format. A requirement can also appear on other diagrams to show its relationship to other modeling elements. OMG Systems Modeling Language (SysML) 1.6 Requirement, AbstractRequirement::text, Satisfy, Verify, DeriveReqt, Copy, SysML Requirements Diagram requirements engineering
INFO The requirements modeling constructs are intended to provide a bridge between traditional requirements management tools and the other SysML models. OMG Systems Modeling Language (SysML) 1.6 Requirement, AbstractRequirement::text, Satisfy, Verify, DeriveReqt, Copy, SysML Requirements Diagram requirements engineering
INFO The rest masses of quarks contribute only about 1% of a proton's mass. Wikipedia
INFO The rest of the connectors linked to a port are external. OMG Systems Modeling Language (SysML) 1.6 Port, ConnectorEnd::partwithPort, internal Connector NestedConnectorEnd
EXAMPLE, INFO The result of Calculate Traction is filtered by a decision node for a threshold value and Calculate Modulation Frequency determines the output of the activity. OMG Systems Modeling Language (SysML) 1.6 DecisionNode, Activity, ActivityParameterNode SysML specification figure
INFO The resulting attraction between different quarks causes the formation of composite particles known as hadrons Wikipedia
INFO The Ritchey–Chrétien telescope ... is a specialized Cassegrain reflector which has two hyperbolic mirrors (instead of a parabolic primary). Wikipedia reflecting telescope, reflector, optical telescope, telescope, secondary mirror, primary mirror, hyperbolic mirror, Ritchey–Chrétien telescope
NOTATION The same modeled UseCase may be visually depicted as separate ellipses within multiple subject rectangles. Unified Modeling Language 2.5.1 UseCase, UseCase Diagram, UseCase::subject
INFO The Sample Problem in Annex D provides definitions of the containing EconomyContext block for which this parametric diagram is shown. OMG Systems Modeling Language (SysML) 1.6 SysML Parametric Diagram, BindingConnector
INFO the second are the muonic leptons, comprising the muon ( μ− ) and the muon neutrino ( ν μ); Wikipedia
INFO The second class of variables we will discuss are “through” variables (also called flow variables). Flow variables normally represent the flow of some conserved quantity like mass, momentum, energy, charge, etc. Modelica By Example Modelica, acausal connection
INFO The second constraint is that the across variable should be the lowest order derivative to appear in any of our constitutive or empirical equations in the domain. Modelica By Example Modelica, acausal connection
INFO The selection and transformation Behaviors on outgoing ObjectFlows can be used to get information out of a DataStoreNode as if a query were being performed. Unified Modeling Language 2.5.1 Activity, DataStoreNode, ObjectFlow::selection, Behavior, ObjectFlow::transformation
SEMANTIC The semantics are undefined for a value of 0 or an integer greater than the number of existing values Unified Modeling Language 2.5.1 StructuralFeature, AddStructuralFeatureValueAction, StructuralFeatureAction, AddStructuralFeatureValueAction::insertAt
SEMANTIC The semantics are undefined for adding a value that violates the upper multiplicity of the StructuralFeature, and for adding a new value to a StructuralFeature with isReadonly=true after initialization of the object that would have the value. Unified Modeling Language 2.5.1 StructuralFeature, AddStructuralFeatureValueAction, StructuralFeatureAction, AddStructuralFeatureValueAction::insertAt, StructuralFeature::isReadonly, MultiplicityElement::/upper, MultiplicityElement::upperValue
INFO The semantics of a Transition depend on its relationship to its source Vertex. Three different possibilities are defined, depending on the value of the Transition’s kind attribute ... Unified Modeling Language 2.5.1 State, StateMachine, Transition, Transition::source, Vertex, TransitionKind, Transition::kind, TransitionKind::external, TransitionKind::internal, TransitionKind::local
INFO The semantics of ElementGroup is modeler-defined. In particular, the body text is not restricted. It can describe the grouped elements as well as elements or values related to the grouped elements. OMG Systems Modeling Language (SysML) 1.6 Comment ElementGroup
NOTATION The send and receive events may both be on the same lifeline. OMG Systems Modeling Language (SysML) 1.6 Message, MessageEnd
INFO The set of Interfaces realized by a BehavioredClassifier are its provided Interfaces, which represent the services and obligations that instances of that BehavioredClassifier offer to their clients. Unified Modeling Language 2.5.1 BehavioredClassifier, Interface, BehavioredClassifier::interfaceRealization, InterfaceRealization, provided Interface
INFO The setupPart of a LoopNode is executed first. When the setupPart has completed execution, the iterative execution of the loop begins. Unified Modeling Language 2.5.1 Activity, Activity Diagram, LoopNode, LoopNode::setupPart
INFO, NOTATION The situation in which the OutputPin of one Action is connected to the InputPin of the same name in another Action via an ObjectFlow may be shown by the optional notations of Figure 16.6. Unified Modeling Language 2.5.1 ObjectNode, ActivityEdge, ObjectFlow
CAVEAT The sole mechanism for asynchronous invocation in fUML is via send signal action. This can be used to achieve the effect of broadcasting and sending objects. Semantics of a Foundational Subset for Executable UML Models 1.4 BroadcastSignalAction, SendObjectAction, SendSignalAction fUML
INFO The source constraint defines the circuit’s electrical source. The ground constraint specifies that the voltage at the ground pin is zero. SysPhS-1.1 Constraint constraint parameter, ConstraintBlock, Block SysPhS
INFO The source constraint defines the voltage across it as a sine wave with the parameter amp as its amplitude. SysPhS-1.1 Constraint constraint parameter, ConstraintBlock, Block SysPhS
INFO The source constraint specifies a sine wave signal with the parameter amp as its amplitude. The sink constraint displays (scopes) the output signal from the signal processor. SysPhS-1.1 Constraint ConstraintBlock, constraint parameter SysPhS, signal processing
EXAMPLE, INFO The spatial relationship of the entities on the diagram sometimes conveys understanding as well, although this is not specifically captured in the semantics. OMG Systems Modeling Language (SysML) 1.6 context diagram, SysML Internal Block Diagram
INFO The specialization on the lower left restricts the number of cylinders to four, requires a light roll bar, and a total of 24 lug bolts over all the wheels. OMG Systems Modeling Language (SysML) 1.6 Generalization, Property::redefinedProperty BoundReference, BindingConnector, nested Property
INFO The specialization on the lower right restricts the number of cylinders to between six and eight, rules out any roll bar, and limits lug bolts per wheel to between 6 and 7, by giving the end path upper and lower values. OMG Systems Modeling Language (SysML) 1.6 Generalization, Property::redefinedProperty BoundReference, BindingConnector, nested Property
INFO The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics. Its exact value is defined as 299792458 metres per second (approximately 300000 km/s, or 186000 mi/s) Wikipedia light
INFO The stakeholder and viewpoint share the same concern via comments that are shown textually as values of the concern property. The comments could be shown graphically with annotation relationships to stakeholders and viewpoints, if needed. OMG Systems Modeling Language (SysML) 1.6 View, Viewpoint, Stakeholder, Stakeholder::/concern, Viewpoint::concernList
INFO, NOTATION The standalone Pin in the notation maps to an OutputPin and an InputPin and one ObjectFlow edge between them in the underlying model. This form should be avoided if the Pins are not of the same type. Unified Modeling Language 2.5.1 ObjectNode, ActivityEdge, ObjectFlow
INFO The Standard Model is the theoretical framework describing all the currently known elementary particles. This model contains six flavors of quarks (q), named up (u), down (d), strange (s), charm (c), bottom (b), and top (t). Wikipedia
INFO The start of the book begins with an eight-year-old orphan girl named Sophie lying in bed ... Wikipedia Webel Parsing Analysis
INFO The state machine has one initial pseudostate, and two states StandBy and On. SysPhS-1.1 StateMachine, Pseudostate, PseudostateKind::initial, PseudostateKind, State SysPhS, SysML, Systems Modeling Language
INFO The stereotype applies to all parameters corresponding to the pins notated by the object node. OMG Systems Modeling Language (SysML) 1.6 Stereotype, Parameter, Pin, ObjectNode, elided Pin notation secondary stereotype, SysML, Systems Modeling Language, MagicDraw SysML, Cameo Systems Modeler
INFO The stereotype does not override UML token offering semantics, just indicates what happens to the token when it is accepted. When the stereotype is not applied, the semantics is as in UML, specifically, tokens arriving at object nodes do not replace ... OMG Systems Modeling Language (SysML) 1.6 ObjectNode, MultiplicityElement::/upper, InputPin, Action::/input, token Overwrite, «overwrite»
INFO The stereotype does not override UML token offering semantics; it just indicates what happens to the token when it is accepted. When the stereotype is not applied, the semantics are as in UML, specifically, tokens arriving at an object node ... OMG Systems Modeling Language (SysML) 1.6 ObjectNode, ActivityNode::outgoing, InputPin, Action::/input «noBuffer», NoBuffer
INFO The stereotypes of proxy and full ports might be elided in these cases to simplify diagrams. OMG Systems Modeling Language (SysML) 1.6 Port FullPort, "standard" Port, ProxyPort